Are you really that scared that you walk around with you hand on your gun? Don't get me wrong if we had the right to carry I would. walking around with a gun in your bag is different then walking around with your hand on it.
Maybe I'm dumb however I hope that I'm never scared enough that I have to walk around like that.
Using some skills like looking around and being aware of your enviorment could help keep you out of trouble more then a gun.